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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9312d9736a8f021c21c676d55a44eaeb60ceece5140b834398e5b52db7f521f8' 
  AND token = 'vfKZfRYjEAh1e4E53Sd7Jup0oahdaqYVJwWyDQ6mM3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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