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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b421775a5a62b7ca940a4e6197dd2fd5753ff3e9a61d8461da58fad7931e19' 
  AND token = 'U9uVVltFDl9qtxBwtS50E5oGa9OfJXfnPFr+aNPiPhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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