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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a9ac98fa2f3c6732fb96ef174ec9f7a15d9bd139240a0c6b9b9b71fae51a9a' 
  AND token = 'MtIyY1bANLp4ZAcTGne+nhhCmTwwiqNdt1mNJ6gsjXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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