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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a52f499ec0839f9a28aea5cf9c9f4764ff4864b2208cc7fc2d20566008026372' 
  AND token = 'ZN9Tgr/PjtI87kYOTe0x8qONuqRr1y92R8GFBpE/kJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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