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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c70a5f25012b7aa5a2e437d68fd52ee22e22a6a1ef4da2a17ae0a7ab8fa89d5' 
  AND token = '5DM40hI54l35CnDS9C27iz/2dOIsySs665ympFWDN58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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