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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0afb3d4a4a16c4e369728f9b2a8736313ebdc7d3ce7c99f8a002e59c2314f618' 
  AND token = '9HyMCfdQeXa6INAXwiIulO31tgv2gB4/3qUBwLb32fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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