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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f31762ea39498e9f13972e4d980c05fb42823b5df12a37c33da65ca03b244e8' 
  AND token = 'UtL521d5Wt4MS0TL/7fcF9e35Hr9+Pv7r76FZYOf4Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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