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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99f22ad14c0b313ff9bf56bea9779056bd254afe122ef4d863bf9abc95469b0' 
  AND token = '4KSZAyEjRoZAulmOhnk6n12de5tHuw6aSYm3Iq0mEh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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