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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b392316c6d4224c788cc786c14d1470caf2bd45e594848bedbb44ad1f371c6ff' 
  AND token = 'rH2if9XcQdNR4ZkRFF/ArOXjoY+wTqe8rEaNsRuCAP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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