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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c911fbb520c3c8cf6a0c627e87d7c7b6b1d0a07f7100d7898df542671b0ca0' 
  AND token = '21NKQmFMGyOHsdAl5hkdfRjg6pXINXXhAlTDtnlkZsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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