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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08e8c559543b9c865762b34c4ad461e207d6df3fa405e6ee275ec06e2445d0a' 
  AND token = 'OLg9ueNNivpllXRDwM8Vj3nuO9OZReWWkAz0KKDHIos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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