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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e98e97520eaae0e88892966ccf4f688079aa6b2bdc0de022de94f5c1e78c9f9' 
  AND token = '/2Jp3qpQzJ/f0s/kbXElHoMejdoWYU1f/0+ruG/e2V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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