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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5720e5fcc015d9eaf06cc3b34975e4ca23e6c60f2ad73ec29201c4696ecaff2' 
  AND token = 'WUAdeXXKUty/tj5u0WgrXoCIj2PJwBszWWIuuFWwWe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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