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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '072efe4db506602c10a0c67f49b17d17f32200986b0474b26c7a4a1820eccc36' 
  AND token = 'gmvqUXzAH0P+WoWnf8OPGUEaRK7iBByeANAAMtD+p5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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