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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4add100f4bb1526f137ed3b61dce5fc84b0b0f3bc33a123687a4a1dfb3b55e5' 
  AND token = '/vVXbT4Ao1S3FO6ILQWyPXDE5FfUOrHSYB83thgDzPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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