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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '895578f7243823a5e0e0471f5ec98ab984c159322f7185963eb7b17e290e98b8' 
  AND token = 'suJmoob3hvt4WSqiKQeJh5G7UVzywmsxwRyr1pYwfvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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