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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8091237f6abdd14274332a157a6bb3b9c0769295de73177b7f4f2c62bfc4b099' 
  AND token = 'FgGUDyvAXE/wymGi7JU63I33HNLUhRo1A6stRaZW5M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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