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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882f562d08ccdf75dbbe6ff1dc260d8cbe02a883265107d20a72eb567974bb7e' 
  AND token = 'jC1zrjaEYassGZBOsJe8bCp+tYpil1tist2myZ6iu4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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