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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1bb0ec64331ab61a80a548a8b298b78565fce0c5e137a4841d14500e37774e9' 
  AND token = 'bsK21QTdkzoAGG7spgt4VKKWo5cQBaQCjBPfGRkUV3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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