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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '450e86e14f8a3cec8d90e5ae551ce41047d7bbdcff81e2ecb44bd097fcc80619' 
  AND token = 'NZRN0LIn1ORlyKaVeivzXKHnZoaiWYFWn6b4xBgI67o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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