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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1619b13a536795a3fcf9710c0d4aed2a30cd98efee60add2b6eb9b5f43eda00' 
  AND token = 'G+MahgmpV99+ZyyppHXAJxAssmk53FZ59DEuKr1g6MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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