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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57390253b30f6e23bfdc5b9d1d8c8305d94ad25d67345be8f6acaca9531afb24' 
  AND token = 'uNJVmflckJ7uHOkVlqhs4MNdtiw696SzgL0y1/5Qij8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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