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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b079ce35981b6148a6617ba4312e94bef0f65d5f8e059322c2aa71d123df57' 
  AND token = 'Pjz3r1S/M/LBDmWE+/FLDd6HDe6JWBGf/sKMHpd4cNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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