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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dbf3ef2db4401ccf3d4d85f509fa910b38a92ad8467fc2f6ef67be9ef09b641' 
  AND token = 'QelSpkgIuMOF0GJ/S1ON05hCmBN4opJv2iPvrLwklI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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