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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce4fb46b7c5acdafb95d4ece0435c8e04a796576519e162304b3cf00344c7617' 
  AND token = 'cZVWwCTBH83opIHBnlFdq7MORafOVO4YkdlZfwPmDEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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