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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e89af4e3801ce8e3029f36251a65a81990912bac4040c4b270e529eadd1e63' 
  AND token = 'YLD3TQ/CZfkXJIYJ7sGSWlExARIMa9vF6/eSYchcMyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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