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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2977a1a4cead129f95d87799b87aef1ba8082d745cf0c586ae1b59df232218' 
  AND token = '6qEjo70m9bEdHEwuJcypgzOvhvY5rc2Iybu4tHMivvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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