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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23020c675be5888ab80ae85c9288710178bf1e6760b57549d5a3a7d2c97871d3' 
  AND token = 'nrDEzSDhgHqMFG9k4FQ3KeZqzhTNSzQ42Rihaq9e5TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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