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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f0316ec9a610ff8d2c89448a1a937de7cda25438cb3e88a120e26a60097a43' 
  AND token = 'mTJWqLIaFNJEk6ZOhdCPD8Qx17BCrVn2t9iY3oNSEMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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