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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c11893fa6f4b35ae9603bae23b62086bfda689bd8ffd2ebf18ab8d6060d0e58' 
  AND token = '7bO+u3/91Jz8Q//rK6fslSvEZ6mtE5oYREzziHDqzTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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