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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0cf15db95d98c4f223a9f0d777da6bcab61f6ac613bf925709d2a167027308f' 
  AND token = 'kzadStEUFAdnnmF5pDmlwvl3EFbi+VvBkHAJMhSmpEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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