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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf8516ad95040cc1ab34b1e02f309be3f230f1be87bc93e15c9c28bcf555aef' 
  AND token = 'elarZbjhg+u8C1DKQCKCc2CFWHjS/B/4PYUA1GLyuq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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