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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919c7786c80606f323d23d8a79f5a99205f78559e08dd32fbcf73679dcb44792' 
  AND token = 'S+SRW823XU2yzyiGzPaQSU19HysHfOSuLlCjhXpvLE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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