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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78e3dfde192f5fb2af5198a661599cccd9b6a6974541745f90b1959768f5dcd1' 
  AND token = '/+nTETY7Fva8dvfIF54A2WiA1gGreJnRz4SwegYO++k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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