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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e3d94581fcf46a2356befa689549e60cb31e2d19138d1ad2132185668d35e8c' 
  AND token = 'vD4x6SMq2hog8EVjnProOHPAYCO5CDVl0j4fezYQIQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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