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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd7e3f4ffd7edb6c6390740a9bf1728bd9ffd8b3b09741b8a77eadc00238a4e' 
  AND token = 'Jgn/5GUbG3YCVeX7FYCvp2tyvWHW3MTT3wHkglvvHzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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