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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c9f2c7fffea01801351a589e5f3fc062a9fb2ad56ee55bb7b6d5aee9a2516b' 
  AND token = 'VYyNG0miOPeC3JI2Zh8H2oAKI1ijGhLeAiNwnZ2aV50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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