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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28245055b09666e9076d9f00d2d9611d4ac2216e0a17d5f7cd71eef5c0780b89' 
  AND token = 'EBdlTCU8usgapbAderfc0Nek1uWW5txJoagLvZYiS/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"
  }
}