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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d2cdc35d420ffac688f749af610e18f830e3b7099519f10feaf98d4ed452407' 
  AND token = '5S9zXwmbmSxG2o9riBkmYKsT0aWZ9rrQP3blTLmmiZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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