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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04001b12593ec5c6c849ddcfd342a7e5b352771a42e09daf54590b871a230f9e' 
  AND token = 'WQb3Ff3KMtI0qDeCFDMl4qKllAOaGmGiQ9EyU8Hbycc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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