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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49b95cf06a9ef9e7ec3715445c9cb6ce4d6a2a281b3a3967eb82d16538a2d088' 
  AND token = '6wwD6cq4MaElv8Bggv9NJb17GrmT4wJONT6ivFHQrqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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