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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28ad47f8610677d597325ab88ac0bec32a0f189a4d3f1d5e07f09d2d97e3ffc' 
  AND token = 'T6vZ7ZCuo09OzS3poebX5O6MAa1C0I9TQRXCTbmYjd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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