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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d4c08c4eb99034470570acb358e6d92f259c9dae094ee1c11f0151057c8932' 
  AND token = '1jsOyeb5aNYl8qztkx27R58pjQk3gSLTXwTaLHpGU9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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