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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '331528b5eaa8ceabd1d15f8690ac3f6dd24480e9ce51d1e51a4e50dbad236a73' 
  AND token = 'qLbJoX1vm9N0LWpfJsnnCIgLrtlo9nH6ZiUH/Trrxn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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