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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889e9755da228bd933e26179fd2935d48cffaf1a61543cc98bd15505939cb64d' 
  AND token = 'p9KylBL4L/WoNwQ7xDLiO1RgPEq4LHUX9Chikll/igM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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