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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d04887958a0f37f3d317b64c2deaeecbaef29f42900541718e8ce6ad344b49' 
  AND token = 'EkuRk7IOGXY650XeBgdZG7sh252KxBh8swWyxQLMIcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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