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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d02a2ce6eec5df5e964738c84e71c7a69a02f8971401a286363aefa32e037db' 
  AND token = 'va8wXD9nkiCn9eLxcJoqo4Ph4e78H2qsZm3ZacfMcBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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