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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267dce8986f81eee556f0e5aa6cb075275d4e75fece621c6d9aae875e995a650' 
  AND token = '2gHYDXUZck0B4VLOfGSgftddu9/AXttWV4B4VxWw2/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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