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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7af5f98acfbc0c098ee8031e06a3951594538689ed7d2ec90a06ce7e6129fc' 
  AND token = 'RQHsEW8h5LjYsnxtSO9svkuAmQAVTwJoxD6aMGTWzBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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