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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abec5417d2e9d233d586895045d0043b94c2c692ffe172b0e8bc2380a5115a02' 
  AND token = 'OVZoDLgwC+2Deag0+2zOXJwW+igymuxcN2VfQUVVBdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}