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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c23d17194a208d117f7559f0387fdc2abb4f9201ab2fdc5133c1f07aef1d800' 
  AND token = 'n/2LYrinERxDYoUT3uLJb1iN8eD5p0LQGNBpoGRTj/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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