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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac9a05689fbd216b812f2baa1602d73ed1cfb8b243bb0c8b27579d5d37a0960' 
  AND token = 'd2UoZkKmyxcMWvpb7bga6OEC6SlifBNUVF16WXbV3ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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