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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ea53c3aed78d27588eacd81aea2c60d366ffb83f4b4fee3b10cc428bdea60db' 
  AND token = 'f5DWI+aYIo5pO2+raTA/WhqPVJgvLUVimEevy2KLDg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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