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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0813b71a648f1e7e3331a25b254e2fa26cf7c1c70916ccbc0b606e7ae909c3bb' 
  AND token = 'cCIgPlPOZ06J2Df4t/PgsdmnxSAs09cCWswPjXimoeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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