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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c50b8cfea9dadcb929654f4f660c3e9b0e8d7f210975a3cebc779a68fe47292' 
  AND token = 'zAHSP6mtG9hXhB7/yQOsoN5yuL1OktQqzRSjc7XjMww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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