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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c66a02dea43b08539d449773f0b311d2d92ecb8fad8db2b3056ef248fabdd6' 
  AND token = 'lWldhjr6xQrbY4HqVr3bXQF46FKsCk1mzGzc9H+zjnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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